实体框架缓慢的第一次调用IRepository DbContext

Question

We are using entity framework 6.1.1 with a DbContext like below and EntityTypeConfiguration to map approximately 400 entities to our DbContext. We then create an instance of our DbContext and use it to create the object sets for each IRepository entity we use in our service layer. The problem we are having which I cannot find a solution to is that the first call to the db is taking approximately 18 seconds when we are using Ants profiler.

I have looked into generating the views but I cannot find a way to do that when the DbContext does not contain hard-coded DbSet collections to the entities. Is there a way to pre-generate the views with our pattern and if so will we see a significant performance improvement?

Or is it time to go down a different path, should we create smaller DbContexts which are for specific areas of the database on logical separations?

  public class Context: DbContext
  {
#pragma warning disable
    Type dummyType_SqlProviderServices = typeof(System.Data.Entity.SqlServer.SqlProviderServices);
#pragma


static Context()
{
  Database.SetInitializer(new ContextatabaseInitializer<Context>());

}

public Context(DbConnection con)
  : base(con, false)
{
}

  protected override void OnModelCreating(DbModelBuilder modelBuilder)
  {
    modelBuilder.Configurations.AddFromAssembly(typeof(ZincContext).Assembly);      
    base.OnModelCreating(modelBuilder);
  }
}

public class EntityRepository<T> : IEntityRepository<T> where T : class
{
    protected IDbSet<T> ObjectSet
    {
      get
      {
        if (_objectSet == null)
        {
          _objectSet = this.DbContext.Set<T>();
        }
        return _objectSet;
      }
    }
}

Answer 1

Generating views based on an entity model is a significant cost the first time that an application executes a query. Use the EdmGen.exe utility to pre-generate views as a Visual Basic or C# code file that can be added to the project during design. You could also use the Text Template Transformation Toolkit to generate pre-compiled views. Pre-generated views are validated at runtime to ensure that they are consistent with the current version of the specified entity model. For more information, see How to:

Pre-Generate Views to Improve Query Performance (Entity Framework)

Isolating Performance with Precompiled/Pre-generated Views in the Entity Framework 4

ENTITY FRAMEWORK CODE FIRST VIEW GENERATION TEMPLATES ON VISUAL STUDIO CODE GALLERY .